I was thinking about new seats. Finally I got inspiration from BeeGee on (http://www.supercub.org/forum/showthread.php?51794-New-Seats)
My friend made for me those lovely leather seats and I installed them today.
Logo in vector format for computer stitching I bought from these guys who normally print decals.
https://graphicsmaxx.com/piper-aircraft-logos-decal-vinyl/piper-333/piper-aircraft-logo-decal-vinyl-graphics-html-pip03
I searched for yellow leather that would the best match the color of my cub. I found
http://www.upholsterme.ca/ledernappafg.html code: giallo taurus 1922

